How can I access data on Charge Only mode (Phone's screen is non-functional!)?

I have a Xiaomi Redmi Note 3. The phone was accidentally dipped into the water which rendered it unusable. I left the phone to dry in a rice bag for 5 days and then took it out and charged it.

The phone booted and was working until I put it to charge. The moment I switched on the power adapter, the screen went black and then the backlight came on.

I remember that before the incident, the phone was in charge-only mode and as the screen is non-functional, I cannot change the mode now. I was wondering, if there is anyway, I could access and recover my data before I give it to any Authorised Service Center Personnel, who is saying that there is no chance that the motherboard is fine.